I mean if you live in a area that see temps that low and you should know that an EV vehicle is a poor choice. Much like if i moved to say Amsterdam, do you think it would be wise for me to buy a TRX Ram to drive around over there? Streets not even big enough to fit it down there, and your weather severely degrades electrical vehicles range and overall function were you live.
Also heat pumps do not work well at those temps, much like how my split unit can not be used to heat my house when the temp drops below 5 degrees, even hyper heat models only go to -5 but they wont work all that great down that low.